I have done quite a lot of photography at airports through the years, over the last couple of years every time going through security the camera and film have been x-rayed, with no problems encountered. Film stock has been slow 50asa up to 3200asa, print and transparency, and predominantly 'pro-spec' films rather than regular over the counter supplies. Some of these films will have been through hand baggage x-ray machines several times. I have not heard of any of my friends encountering any problems either.